If Preview shows the page but cannot find words that are visibly printed on it, the PDF may contain page images rather than searchable text. On a Mac, try Preview’s File > Export > Embed Text option to recognize text and add it to the PDF. Then search the exported copy in Preview. If that option is missing or the result is inaccurate, use a dedicated OCR tool and check its output.

Why Preview may not find the words

A scanned page can look like a document while actually being stored as an image. Preview’s search works on text it can recognize in a PDF; an image of printed words may need optical character recognition (OCR) before it can be searched. Apple documents an OCR route in Preview: its Embed Text export recognizes text in an image-based PDF and embeds that text in the document. Apple’s Preview guide explains the Embed Text option.

First check whether the problem is simply the search query or selection tool. Open the PDF in Preview and enter a short, distinctive word in the toolbar search field. Preview searches an entered phrase exactly by default; use the magnifying-glass menu and choose Any Match if you want to find any word in a multiword query. Apple also notes that the search field may be hidden until you resize the window. Apple’s instructions for finding text in PDFs cover these controls.

If the term is printed clearly but produces no match, test whether Preview can select it. Choose Tools > Text Selection, then drag across a word. If you can select and copy the word, the PDF has text available and the search may need a simpler spelling, shorter phrase, or different match setting. If you can select only a rectangular area of the page or cannot select the printed word, proceed to OCR. A password may restrict text selection or copying; Preview’s inspector can show whether the PDF is encrypted, and you may need the password. Apple’s troubleshooting guidance describes both the Text Selection tool and the password restriction.

Use Preview’s built-in OCR

  1. In Preview, open the scanned PDF. If the original matters, use File > Duplicate first and perform the OCR export on the duplicate, so the source remains available separately.
  2. Choose File > Export.
  3. In the export dialog, select Embed Text and save the exported PDF.
  4. Open the exported file in Preview and search for a distinctive word from the scan. Try a second word elsewhere on the page if the first one is not found.

Apple says Preview scans the image-based PDF and embeds recognized text so it can be selected in any PDF viewer. The Embed Text option appears only when text has not previously been recognized in the document. That is a meaningful limitation: if the option is absent, it does not necessarily mean OCR failed. The document may already contain recognized text, or the available Preview workflow may not expose the option for that file. Apple’s page does not document a separate Preview command to force OCR in that situation. See Apple’s Embed Text instructions and limitation.

Once the export completes, search in the exported file rather than assuming the original was changed. Test a few terms, including one with punctuation or a number if those matter to your task. OCR converts visual shapes into text, and recognition can be imperfect: a low-resolution, skewed, faint, handwritten, or complexly laid-out scan may produce missing or mistaken characters. If a match matters, compare it with the original page image before relying on the recognized text.

If Embed Text is unavailable or the search still fails

Try Preview’s ordinary text-selection checks before changing tools: choose Tools > Text Selection and attempt to select a word. If the text is selectable but a particular query fails, search a shorter distinctive string and check whether Any Match is appropriate. For a protected PDF, resolve the password restriction with the document owner or use the authorized password; OCR does not remove access restrictions.

If the page remains image-only, or Preview does not offer Embed Text, use an OCR application that explicitly supports making an existing scanned PDF searchable. Adobe documents this workflow in Acrobat: open the PDF, choose All tools > Scan & OCR > In this file, set the page range and recognition language, then choose Recognize Text. Adobe says the process creates a searchable text layer and advises reviewing the result for accuracy. The menu labels can vary by Acrobat version, so follow the controls shown in the installed version. Adobe’s current instructions for recognizing text in scanned PDFs.

Choose an OCR language that matches the document where the tool provides that setting. Then inspect pages with small print, columns, tables, stamps, or faint marks. OCR can make a scan searchable without making its recognized words correct; verify names, dates, totals, and quoted passages against the page image. If a required word is repeatedly missed, use a sharper scan or a dedicated OCR tool with language and page controls rather than treating a failed search as proof that the word is absent.

When you only need text from one visible passage

For a one-off excerpt, you may not need a searchable version of the whole PDF. Preview’s Live Text can select and copy text from a photo or image: open the image, point at the text, drag to select it, Control-click, and choose Copy Text. Apple notes that Live Text is not available in every region or language. Its documented instructions specifically describe photos and images, so use the PDF export route above when your goal is to add searchable text to a scanned PDF. Apple’s Live Text guide for Preview.

A practical decision path

Use Preview’s Embed Text export when it is offered and your goal is to search a scan. If it is missing, first check for existing selectable text and a password restriction. If the document still has no searchable text, use a dedicated OCR workflow and confirm the exported copy with real searches and visual checks. For a single readable excerpt, Live Text may be enough if the content is available as an image and the feature supports its language and region.

If you are keeping the PDF, Preview, and a short list of follow-up tasks open while you work, Wallo can organize existing Mac windows and to-dos locally by goal, with keyboard focusing. It does not perform OCR, so the text-recognition step still belongs in Preview or an OCR application.

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